Several days ago, perennial presidential candidate Mike Huckabee charged that President Obama was ready to lead Israeli Jews "to the ovens." A few days later, he said he might use not only the FBI but even the US military to prevent abortions. And around the same time, Ted Cruz called Obama the world's biggest funder of Islamic terrorism. There was a day when cracks like these would have stopped the political world in its tracks, spurring transgressive glee from supporters and outrage from...